The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 17, 2007
Filed:
Dec. 13, 2004
Ikuya Yagisawa, Tokyo, JP;
Naoto Matsunami, Hayama, JP;
Yasuyuki Mimatsu, Yokohama, JP;
Akihiro Mannen, Yokohama, JP;
Kenji Muraoka, Odawara, JP;
Ikuya Yagisawa, Tokyo, JP;
Naoto Matsunami, Hayama, JP;
Yasuyuki Mimatsu, Yokohama, JP;
Akihiro Mannen, Yokohama, JP;
Kenji Muraoka, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a memory apparatus, there are provided a mirror primary LU which is a memory region on a plurality of storage media formed of nD+1P, a mirror secondary LU that is a memory region on a plurality of storage media formed of mD+1P, an n-RAID control subprogram for performing RAID control of nD+1P, an m-RAID control subprogram for performing RAID control of mD+1P, and an LU mirror subprogram for performing writing into the mirror primary LU and mirror secondary LU and then effectuating duplexing or 'mirroring' when a computer issues a data write request. The 'm' and “n” are different integers more than or equal to 2.